SEARCH FOR LUMINANCE CONTRAST THRESHOLDS FOR PAVEMENT MARKINGS
This study, performed in the field with observers traveling under normal day and night traffic conditions, is based on measurements of the retroflected luminance coefficient and of the luminance contrast made by the ECODYN high-speed measuring system. Comparing the observers' responses to the measurement results yields some useful items of information. Some concern quality criteria already covered by specifications, such as RL, and serve as a check of validity of the values currently applied. Others concern new quality criteria accessible with apparatus like ECODYN, such as CN and CJ, for which the values that best serve road users are still to be determined. The validity of the values of RL, corresponding to the French requirement with the geometry e = 3.5 degrees and a = 4.5 degrees and to the European requirement with e = 1.24 degrees and a = 2.29 degrees, is confirmed. Above a certain day contrast threshold, measured under an overcast sky or under a sunny sky, the great majority of the observers regard the markings as sufficiently visible.
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Availability:
- Find a library where document is available. Order URL: http://worldcat.org/issn/03476049
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Corporate Authors:
PTRC Education and Research Services Limited
Glenthorne House, Hammersmith Grove
London W6OL9, England -
Authors:
- Bry, M
- Krauze, D
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Conference:
- Proceedings of the Conference: Road Safety in Europe and Strategic Highway Research Program (SHRP)
- Location: Prague, Czech Republic
- Date: 1995-9-20 to 1995-9-22
- Publication Date: 1996-3
Language
- English
Media Info
- Features: Figures; References; Tables;
- Pagination: p. 255-274
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Serial:
- VTI Conferens
- Publisher: Swedish National Road and Transport Research Institute (VTI)
- ISSN: 0347-6049
Subject/Index Terms
- TRT Terms: Contrast; Luminance; Quality control; Road markings; Visibility
- Uncontrolled Terms: Quality
- Subject Areas: Design; Highways; Operations and Traffic Management; Safety and Human Factors; I85: Safety Devices used in Transport Infrastructure;
Filing Info
- Accession Number: 00723359
- Record Type: Publication
- Report/Paper Numbers: No. 4A, Part 5
- Files: TRIS
- Created Date: Jul 30 1996 12:00AM